Question

which of the following is true of the heart layer indicated in the image below?

Explanation:

• Cardiac muscle tissue is found in the myocardium (the middle layer of the heart).
• The endocardium lines all chambers and valves.
• The epicardium is the inner lining of the serous pericardium.
• A dense network of collagen fibers that stabilize the heart's position is part of the fibrous pericardium.

Assuming the indicated layer is the myocardium (common in such diagrams), the key characteristic is having cardiac muscle tissue.

Answer:

It contains cardiac muscle tissue.